/Engine/Source/Editor/UnrealEd/Public/WorkflowOrientedApp/WorkflowTabManager.h
Closes any tabs of the specified type that match the payload (or all of them if the payload is NULL)
void CloseTab ( [TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< [FTabPayload](API\Editor\UnrealEd\WorkflowOrientedApp\FTabPayload) > Payload )